By the way, this particular transport was set on perpetual attack. So when the ship arrives at the land, the attack path appears to continue onto the land, but does not. At least until now...
It was possible, yes, but it shouldn't have been! haha
I looked at the Daily Cycle code and it still accounted for a sea unit attacked a land sector. I'm thinking I must have allowed that in the interface early in the game and just never updated the Cycle. Since it doesn't allow it in normal attacks, perpetual attacks should be no different. I've fixed the Cycle.